Furnace construction



July 19, 1932. R. D. FoLTz FURNACE CONSTRUCTION Filed May 4, 1929 Patented July 19, 1932 .UNITED STATES PATENT., OFFICE y RAYMOND D. FOLT F SOUTH ORANGE, NEW JERSEY, ASSIGNOR TO M. H. DETBICX Application led Hay 4,

This invention relates to construction of furnaces of the t pes wherein the furnace chamber walls an roof, or parts thereof, are

formed of refractory tiles, in order that they may withstand high temperatures. It finds particular application in such furnace walls and roofs wherein the tiles or refractories are suspended or anchored on exterior supporting members. i0 A general object of the invention is the rovision of an improved vconstruction for urnace walls and arches, and a novel and advantageous refractory tile for use in the same, whereby both furnace walls and furnace roofs may be constructed for the most part of tiles of a single size and form, with suitable provision for anchorage of the tiles in such manner as to retain them in the desired assembly in the structure yet permit them a proper degree of individual movement for the accommodation of thermal expansion, while maintaining close joints effective to prevent fiame leakage between juxtaposed tiles.

A. specic obj ect of the invention is the provision of a special refractory tile which, because of its structural characteristics, is specially qualified to contribute the aforementioned advantages to furnace roofs and walls in which it is employed, and which is adapted for manufacture economically and in quantities, without requiring special handling or treatment.

Another object is the provision of an improved construction for furnace roofs and walls, and an improved refractory tile for forming same, whereby tight joints may be provided between j uXtaposed tiles and at the same time the desirable latitude of fit allowed for accommodation ofthe variations in size which are unavoidably encountered in the manufacture and installation of heavy and comparatively roughly formed structural elements such as in the construction of large furnaces.

the-r and further objects will be pointed out or indicated hereinafter, or will become apparent to one skilled in the art upon an understanding of the invention or its employment in practice. v 5 For the purpose of aiding in the disclosure or cIIIcAeo, ILLINOIS, A conPoIzATIoN or ILLINoIs IURNACE CONSTRUCTION 1929. Serial No. 380,335.

tion, certain examples of its embodiment, but

it is to be understood thatthese are presented for purpose of illustration merely, and are not to be given any interpretation calculated to limit the claims short of the true and most conprehensive scope of the invention in the ar In such drawing,

Fig. represents a face view of an assembly of one form of refractory tiles in accordance with my invention, which assembly may be taken as illustrative of their relationship in ither a furnace roof or a furnace wall strucure;

Fig. 2 is a sectional elevation of a portion of a furnace wall structure in which the invention may be embodied;

Fig. 3 is a sectional elevation of a portion of a furnace roof structure in which the invention may be embodied; and

Fig. 4r is an end elevational view of one of the tiles illustrated in Fig. l.

For economy in the manufacture, installation and maintenance of furnaces, such as large boiler furnaces, metallurgical furnaces and other industrial furnaces, it is quite desirable that the refractories and other structural elements be standardized, or of uniform size and design, insofar as possible, and that such standardized parts be qualified for a wide variety or versatility of use, so that furnaces of great variety of design may be constructed or equipped by the use of such standardized parts. Due to the unavoidable variations which occur in manufacture of such structural elements as refractories, iron castings, structural steel, concrete foundations and other elements entering into the construction of large furnaces, it is very diiiicult, with reasonable economy, to obtain in the assembly of the parts the precision and nicety of fit which may be the theoretical ideal. Consequently, it becomes important to include in such standardized structural elements compensating features whereby variations in size may be accommodated and a proper fit obtained under varying conditions occurring both in installation and operation of the furnaces.

The present invention provides an improved refractory tile construction and furnace arch and furnace wall construction USO.

The nature of the invention may be most quickly ascertained by consideration of the examples shown in the drawing. Referrin to Fig. 2, it will be understood that the mem er designated by the reference numeral 10 is a tile engaging member in the nature of a bracket which forms an element of a furnace wall construction. Reference may be had to British Patent No. 238,7 24 of M. H. Detrick Company for an illustration of a manner in which such brackets may be employed for the anchorage of wall sections 11, made up of refractory tiles, said brackets being supported on a metallic framework, portions of which are indicated at 12. Likewise, by reference to Fig. 3, it will be understood that the member designated by the reference numeral 14 is a tile-retaining member in the nature of an arch bar for a furnace arch or roof portion, which arch bar may be suspended in a well known fashion from a supporting framework by means of hangers 15, and. may be disposed in either a horizontal or sloping position, the refractory tiles 16 being suspended on said arch bar, face to face, so as to form a course, which constitutes a roof or arch section. In Fig. 1, the members designates by the reference numeral 17 are tile-retaining members which maybe in the nature of either the member 10 or the member 14. These tileretaining members are provided with tile engaging' portions 17 here shown as marginal anges, the purpose of which is to afford a retentive anchorage for the refractory tiles 18. These tiles are as nearly identical as the limitations of manufacture permit, and are formed of a refractory material such as fire clay, suitably burnt. They are formed at one end with a T-shaped slot 18a adapted to accommodate the tile-retaining members and their tile engaging parts with a liberal clearance, so that the tile, while retained thereon, may have a certain latitude of both shifting an angular movement with respect to the tile engaging member. The T-shaped slot 18 is centered on the median line between the 1,eee,sse

lateral faces 18" and 18 of the tile, which lateral faces are parallel. The offset side faces 18d and 18' are likewise parallel, both with respect to each other and with respect to the lateral facesA 18b and 18, but they are offset with respect to the latter so as to provide a projection at one side ofthe tile and a corre- 'Y spondin or complementary in-set at the other side. T e faces 18t between faces 18" and 18 on the one side, and 18 and 18 on the other side, extend obliquely to form bearing shoulders, the angle of which with respect to the lateral faces 18 and 18 is the same at both sides of the tile. The relationship of the bearing shoulders 18t with respect to the slots 18 and the lateral faces is such that when the anchorage lugs 18 of the juxtaposed tiles are in alignment, their ends also will be in alignment. Consequently, when the tiles are placed together side to side with their ends in alignment, as illustrated in Fig. 1, the salient offset portion of one will overlap the reentrant offset portion of another and their juxtaposed bearing shoulders 18t will be in abutment, but the faces 18 and 18 of one tile will be slightly spaced apart from the adjacent faces 18b and 18d of the other tile.

In the assembly of the furnace, the suitable tile-retaining members 17 being arranged in parallel collateral relationship, the requisite number of tiles 18 are slid onto the tile engaging portions, the tiles on the respective tile-retaining members thus being arranged in courses with their broader faces in abutment and the juxtaposed faces of tiles in adjacent courses slightl spaced apart, the intervening spaces bein lled with a plastic refractory material, if esired. If in a Wall construction, the courses will run upwardly, as illustrated in Fig. 2 and if in a roof, the courses will run. in a horizontal or sloping direction, as illustrated in Fig. 3, and the bearing shoulders 18t of tiles in juxtaposed courses will be in contact. Due to the play allowed for the tile-retaining members in the tile slots, individual tiles may accommodate their positions to laterall adjacent tiles so as to obtain the desired caring contact of their bearing shoulders. Upon expansion of the tiles by heat, the contact of the bearing shoulders is maintained, the transverse expansion of the tiles being accommodated by the spaces between their lateral faces. When the tiles are suspended in a roof or arch, as typified in Fig. 3, the bearin engagement of the shoulders is maintainedy the weight of the tiles. When they are disposed in an upwardl running course in a wall, as typiied in Fig. 2, the bearing engagement of the shoulders is maintained 'by the expansion of the tiles, which expansion will be greater at their inner ends than at their outer ends, due to the fact that the inner ends are more highly heated. Accordingly, both at installation and in operation of the furnace,

l eral face and terminating at a side face mentary contour, the respective tiles having 55 lin-set therefrom, the obli ue faces of juxta- 1,ses,au2 .3

the bearing shoulders of the juxtaposed tiles will bemaintained in contact to form a close joint.

The tiles of this construction, in addition 5 to affording the advantages above pointed out, are comparatively simple to manufacture, may be given uniform burn, and have adequate strength in their anchoring portions. They may be employed in numerous m varieties of furnace arch and wall constructions and may be made in various dimensions of length, width and thickness.

What I claim is: l 1.` A n element for furnace construction u consistin of a refractory tile having its opposite si e margins of complementary form and shaped at one side with a bearing shoulder offset diagonally outward and at the other side with a bearing shoulder offset di- 2 agonally inward, said side margins having parallel faces conjoining the inner and outer ends of said diagonal bearing shoulders. 2. An element for furnace construction consistin ofa refractory tile having its op- 25 posite si es of complementa contour, said sides having parallel laterallfaces for a part of their length and parallel oblique faces extending from said ateral faces, the oblique face at one side of the tile extending 30 outwardly from the adjacent lateral face and terminating at a side face of the tile which is out-set from that lateral face, the oblique face on the other side of the tile* extending inwardly of the latter from the adjacent latwhich is in-set from said lateral face, said side faces being aproximately parallel to said lateral faces, and the tile being provided with an anchoring slot adjacent one end. 4g 3. In furnace construction, the combination with tile-retaining members, of refractory tiles loosely anchored thereon and dis- Bosed in collateral relationship, said tiles aving their juxtaposed faces of complearallel lateral faces for a ortion of their en h and parallel oblique aces conjoining f rsai lateral faces, the oblique face at one side ofthe tile extending outwardly from the 6o adjacent lateral face and terminating at a side face which is out-set from the latter, the oblique face at the other side of the tile extending inwardly from the adjacent lateral face and terminating at a side face which is posed'tiles being dis ose in abutment and the tiles having anc oring slots accommodating the tile-retaining members. In witness whereof I have hereunto sub- 60 scribed my name.

' RAYMOND D. FOLTZ. 

